﻿<style>
    body {
        font-family: system, -apple-system, '.SFNSText-Regular', 'SF UI Text', 'Lucida Grande', 'Segoe UI', Ubuntu, Cantarell, sans-serif;
        color: #fff;
        background-color: #8aba87;
        text-align: center;
        font-size: 40px;
    }

    h2 {
        padding: 0;
        margin: 0;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }

    #close {
        color: white;
        opacity: 0.7;
        position: absolute;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        font-size: 12px;
        text-decoration: none;
    }
</style>

<h2>Hello World!</h2>
<a id="close" href="javascript:window.close()">Close this Window</a>